Friction Powered Trucks: No batteries needed, just a little push and the truck will rev up with a roar and go a long distance. Perfect Size for Little Hands: Designed for toddlers’ hands, easy for little kids to push and grip, perfect size , not too big or small. Construction Arm Moveable: Each truck has a moveable working arm, kids can do all kinds of construction job with the vehicles. Great gift idea: Nice gift package included, 4-pack of different decent-size vehicles, makes it a great gift for vehicle-love boys and girls.